Rotating the forearm palm-down and palm-up while holding a dumbbell by one end. Trains the forearm rotators through their full range.
Primary muscles
Secondary muscles
This information is general fitness guidance, not medical advice. Stop if you feel pain and consult a qualified professional.
Main muscles working (thicker lines)
Sit with the forearm resting on a bench or thigh, wrist just past the edge, holding one end of a light dumbbell (or a dumbbell handle loaded on one side) pointing up.
Keep the forearm still on the support.
Slowly rotate the hand to turn the palm down.
Return through vertical and rotate to turn the palm up.
Continue alternating for the target reps, then switch arms.
Breathing: Breathe steadily and evenly throughout.
Rotate from the forearm
Slow and controlled
Choke up to make it easier
Moving the elbow or shoulder
Letting the weight flop to the side
Using too long a lever too soon
Start with a short lever and light weight; the long lever loads the wrist heavily.